scholarly journals A New Numerical Model to Analyze Stress Distribution of TMJ Disc from 2-D MRI Scans

2012 ◽  
Vol 2 (5) ◽  
pp. 66-75 ◽  
Author(s):  
Yaser M. Alkhiary ◽  
Tamer M. Nassef ◽  
Inas A. Yassine ◽  
Seham B.Tayel ◽  
Abd ElSalam kh.Ezzat
Keyword(s):  
Numerical Model ◽  
Stress Distribution ◽  
Tmj Disc ◽  
Mri Scans

Stress in Bonded Adherends for Single Lap Joints

1996 ◽  
Vol 12 (03) ◽  
pp. 167-171
Author(s):  
G. Bezine ◽  
A. Roy ◽  
A. Vinet
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Numerical Model ◽  
Stress Distribution ◽  
Normal Stress ◽  
Lap Joints ◽  
Axial Loads ◽  
Normal Stress Distribution ◽  
Single Lap Joints ◽  
Element Technique

A finite-element technique is used to predict the shear stress and normal stress distribution in adherends for polycarbonate/polycarbonate single lap joints subjected to axial loads. Numerical and photoelastic results are compared so that a validation of the numerical model is obtained. The influences on stresses of the overlap length and the shape of the adherends are studied.

Effect of the frictional coefficient and pre-tension on stress distribution of fabric during the weaving process

2017 ◽  
Vol 88 (8) ◽  
pp. 904-912
Author(s):  
Zhiping Ying ◽  
Zhenyu Wu ◽  
Xudong Hu ◽  
Xiangqing Zhou
Keyword(s):  
Numerical Model ◽  
Stress Distribution ◽  
Mechanical Performance ◽  
Frictional Coefficient ◽  
Woven Fabric ◽  
Weft Yarn ◽  
Tension Stress ◽  
Initial Shape ◽  
Warp Tension ◽  
Fluctuation Range

The non-uniform stress distribution of woven fabric has a significant influence not only on its mechanical performance in service, but also on its weaving efficiency in the fabrication process. For investigating the stress distribution in woven fabric, a numerical model at the yarn scale was established to simulate the interlacing process between the weft and warp yarns using an explicit finite element solver. The yarns were assumed to be a homogeneous continuum and the transversal isotropic constitutive equation was used. A modified lenticular initial shape was used as the cross-section of the yarn and trajectories of warp and weft yarns were set to be straight. The classical Amonton–Coulomb law was used for the tangential behavior between the weft and warp yarns. The simulation results reveal that the interaction between weft and warp yarns consists of three phases in terms of contact, adhesion and sliding. The sectional stress distribution in the weft yarn determined by multi-points contact between a single weft yarn and a group of warp yarns was also analyzed. The tension stress of the weft yarn was larger in the middle part than that in both sides. Based on the numerical model, the effects of two key parameters, namely the frictional coefficient and weft pre-tension, on the stress distribution were discussed in detail. The weft crimp angle and warp tension distribution uniformity decreased as the frictional coefficient decreased, whereas the warp tension fluctuation range did not obviously decrease. However, an improved method by exerting pre-tension in two ends of weft yarn was proposed and the warp tension fluctuation range was significantly decreased. The distribution trend of warp tension obtained from the numerical simulation showed an acceptable tendency with experiment measurements.

Numerical Investigation of the Minimum Roof Thickness of Mining Stope in Bailing Copper-Zinc Mine

2014 ◽  
Vol 670-671 ◽  
pp. 668-673
Author(s):  
Jiang Feng Ma ◽  
Xiu Li Zhang ◽  
Yu Yong Jiao ◽  
Hu Nan Tian
Keyword(s):  
Rock Mass ◽  
Numerical Model ◽  
Stress Distribution ◽  
Numerical Investigation ◽  
Damage Zone ◽  
Three Dimensional ◽  
Surface Displacement ◽  
Ore Body ◽  
Zinc Mine ◽  
Copper Zinc

A three-dimensional numerical model of the rock mass including ore body is established by FLAC3D software, and then the surface subsidence caused by backfilling under different roof thicknesses of mining stope (the vertical distance between upper mining limit and surface) are calculated and analyzed. By comparing the surface displacement, the stress distribution, and the damage zone under different conditions, the minimum roof thickness is determined.

scholarly journals Investigation of the influence of the railroad track on the stress state of the tunnel lining

2018 ◽  
Vol 239 ◽  
pp. 01020
Author(s):  
Mikhail Pleshko ◽  
Alexei Revyakin ◽  
Natalia Malishevskaya
Keyword(s):  
Stress State ◽  
Numerical Model ◽  
Stress Distribution ◽  
Elastic Layer ◽  
Tunnel Lining ◽  
Railway Track ◽  
Deformation Characteristics ◽  
Railroad Track ◽  
Circular Tunnel ◽  
Moving Vehicles

Tunnel lining takes significant loads from moving vehicles. The consequences of their impact depend on the design of the railway track and the deformation characteristics of its elements. For their study, a numerical model of a circular tunnel has been developed. As a result of the model calculation, the values of the main vertical stresses in the main tunnel structures were obtained. It is established that with increasing loads from the wheel to the rail from 100 to 200 kN, the voltage on average increases by 50%. The stress distribution is affected by the rigidity of the elastic layer. When it increases, the vertical stresses in the sub-rail support decrease nonlinearly, while in traveling concrete they increase nonlinearly.

Stress distribution in the TMJ disc during a jaw opening movement simulated with a 2D finite element model

2009 ◽  
Vol 12 (sup1) ◽  
pp. 33-34 ◽  
Author(s):  
M. Aoun ◽  
A. Ramos ◽  
A. Ballu ◽  
M. Cid ◽  
J.A. Simões ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Model ◽  
Element Model ◽  
Jaw Opening ◽  
Tmj Disc

Mechanism of Local Scour Around Submarine Pipelines Based on Numerical Simulation of Turbulence Model

2005 ◽  
Author(s):  
Lin Lu ◽  
Yucheng Li ◽  
Bing Chen
Keyword(s):  
Shear Stress ◽  
Numerical Model ◽  
Stress Distribution ◽  
Flow Structure ◽  
Turbulence Model ◽  
Critical Factor ◽  
Local Scour ◽  
Shear Stress Distribution ◽  
Submarine Pipeline ◽  
Rng Turbulence Model

In this paper, the mechanism of local scour around submarine pipeline is studied numerically based on a Renormalized Group (RNG) turbulence model. To validate the numerical model adopted in this paper, the equilibrium profiles of local scour for two cases are simulated and compared with the experimental data. It shows that the RNG turbulence model can give an appropriate prediction for the configuration of equilibrium scour hole, and it is applicable to this situation. The local scour mechanism around submarine pipeline including the flow structure, shear stress distribution and pressure field is then analyzed and compared with experiments. For the further comparison and validation, especially for the flow structure, a numerical model of Large Eddy Simulation (LES) is also developed in this paper. The numerical results of RNG demonstrate that the critical factor governing the equilibrium profile is the seabed shear stress distribution in the case of bed load sediment transport, and the two-equation RNG turbulence model coupled with the law of wall is capable of giving a satisfying estimation for the bed shear stress. Moreover, the piping phenomena due to the great difference of pressure between the upstream and downstream parts of pipeline and the vortex structure around submarine pipeline are also simulated successfully, which are believed to lead to the onset of local scour.

scholarly journals Finite Elements Analysis of the Temporomandibular Joint Disc in Patients with Intra-articular Disorders

2020 ◽  
Author(s):  
Linfeng Lai ◽  
Guofeng Xiong ◽  
Chenyao Huang ◽  
Fan Zhou ◽  
Fujian Xia
Keyword(s):  
Friction Coefficient ◽  
Finite Elements ◽  
Stress Distribution ◽  
Temporomandibular Joint ◽  
Finite Elements Analysis ◽  
Temporomandibular Joint Disc ◽  
Fea Model ◽  
Tmj Disc ◽  
Joint Disorder ◽  
3D Fea

Abstract Background： Anterior and/or medial displacement of the temporomandibular joint disorder(TMJ) disc or intra-articular disorders( ID) is the most common form of TMJ dysfunction(TMD).TMD cause change of friction coefficient during TMJ movement. In the present study, We provided a 3D finite elements models(FEM) including the maxilla, disc and mandible and evaluated the stress distribution with different friction coefficient. Methods: 14 volunteers without TMD and 20 TMD patients,who were diagnosed by MRI, were selected.CT and MRI data were collected to build 3D FEA model of mandibular and TMJ disc.Stress distribution with different friction coefficient was measured. Result: In the normal model, stress distribution on TMJ disc was 2.07±0.17,1.49±0.14,1.41±0.14MPa with 0.001 0.3 and 0.4 friction coefficient.In TMD model,stress distribution is 3.87±0.15,7.23±0.22,7.77±0.19MPa respectively. Conclusion: When the friction coefficient of the side with anterior displacement increased, stress on the disc, condyle and mandible of the opposite side increased. Simultaneously, stress values of the disc, condyle and mandible were higher than those of the normal lateral joint.

scholarly journals Finite Elements Analysis of the Temporomandibular Joint Disc in Patients with Intra-articular Disorders

2020 ◽  
Author(s):  
Linfeng Lai ◽  
Guofeng Xiong ◽  
Chenyao Huang ◽  
Fan Zhou ◽  
Fujian Xia
Keyword(s):  
Friction Coefficient ◽  
Finite Elements ◽  
Stress Distribution ◽  
Temporomandibular Joint ◽  
Finite Elements Analysis ◽  
Temporomandibular Joint Disc ◽  
Fea Model ◽  
Tmj Disc ◽  
Joint Disorder ◽  
3D Fea

Abstract Background：Anterior and/or medial displacement of the temporomandibular joint disorder(TMJ) disc or intra-articular disorders( ID) is the most common form of TMJ dysfunction(TMD).TMD cause change of friction coefficient during TMJ movement. In the present study, We provided a 3D finite elements models(FEM) including the maxilla, disc and mandible and evaluated the stress distribution with different friction coefficient.Methods: 14 volunteers without TMD and 20 TMD patients,who were diagnosed by MRI, were selected.CT and MRI data were collected to build 3D FEA model of mandibular and TMJ disc.Stress distribution with different friction coefficient was measured.Result: In the normal model, stress distribution on TMJ disc was 2.07±0.17,1.49±0.14,1.41±0.14MPa with 0.001 0.3 and 0.4 friction coefficient.In TMD model,stress distribution is 3.87±0.15,7.23±0.22,7.77±0.19MPa respectively. Conclusion:When the friction coefficient of the side with anterior displacement increased, stress on the disc, condyle and mandible of the opposite side increased. Simultaneously, stress values of the disc, condyle and mandible were higher than those of the normal lateral joint.

The Analysis of Comparison of the 1000KV UHV Electrical Equipment and Circuit

2014 ◽  
Vol 1065-1069 ◽  
pp. 1267-1272
Author(s):  
Po Gao ◽  
Zhi Cheng Lu ◽  
Zhu Bing Zhu ◽  
Sen Lin
Keyword(s):  
Numerical Model ◽  
Stress Distribution ◽  
Response Spectrum ◽  
Electrical Equipment ◽  
Seismic Resistance ◽  
Ansys Software ◽  
Acceleration Response ◽  
Load Carrying ◽  
Acceleration Response Spectrum ◽  
Complete Circuit

The single UHV electrical equipment and numerical model for its circuit would be established by the Ansys software, after respectively analyze the Earthquake acceleration response spectrum of all the models, the stress distribution of equipments of all numerical model and its top displacement results would be get. By comparing the differences of every model’s result and focusing on the load-carrying properties of the structure, the experiments would get further optimizing space and confirm the circuit connection mode that is favorable for the Seismic resistance. After the comparison of single equipment and circuit results, it is suggested to establish a complete circuit numerical model while analyze and verify the converting station.

Influence of sewer sediments on flow friction and shear stress distribution

1995 ◽  
Vol 31 (7) ◽  
pp. 117-126 ◽  
Author(s):  
Gustavo Perrusquía ◽  
Ole Petersen ◽  
Torben Larsen
Keyword(s):  
Shear Stress ◽  
Numerical Model ◽  
Stress Distribution ◽  
Hydraulic Resistance ◽  
Numerical Experiments ◽  
Shear Stresses ◽  
Elimination Method ◽  
Sewer Pipes ◽  
Flow Friction ◽  
Boundary Shear

Most sewers contain more or less deposited sediments. The paper discusses the distribution of the boundary shear stresses and the hydraulic resistance in part-full sewer pipes with such deposited sediments. The discussion is based on a series of numerical experiments using a validated numerical turbulence model. The results from the numerical model are compared with the sidewall elimination method. The validity of the sidewall elimination method is evaluated.

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